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Business segments - Schedule of Identifiable Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Segment Reporting Information [Line Items] |  |
Identifiable assets | $ 1,348,819 | $ 1,271,558
Operating segments | Health Services |  |
Segment Reporting Information [Line Items] |  |
Identifiable assets | 543,361 | 482,560
Operating segments | U.S. Federal Services |  |
Segment Reporting Information [Line Items] |  |
Identifiable assets | 440,006 | 441,521
Operating segments | Human Services |  |
Segment Reporting Information [Line Items] |  |
Identifiable assets | 153,141 | 186,406
Other/Corporate |  |
Segment Reporting Information [Line Items] |  |
Identifiable assets | $ 212,311 | $ 161,071

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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